Tectaria devexa (Kunze) Copel.

Family

Tectariaceae

Nomenclature

Tectaria devexa (Kunze) Copel., Philipp. J. Sci., Sect. C, Botany 2: 415. 1907; Ching, Sinensia 2: 16. 1931; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 404. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 505, f. 297. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 23: 242. 1965; Tagawa & K.Iwats., Fl. Thailand 3: 366. 1988; Holttum, Fl. Males., Ser. II, Pterid. 2: 57. 1991; Boonkerd & Pollawatn, Pterid. Thailand: 212. 2000. – Aspidium devexum Kunze, Bot. Zeit. 1848: 259. 1848. – Type: Zollinger 2717, Java (LZ, lost; iso B, G, L).

Polypodium membranaceum Hook. in Blakist., Yang-tsze 365. 1862, non D.Don 1825. – Pleocnemia membranacea Bedd., Suppl. Ferns Brit. Ind.: 15. 1876; Bedd., Handb. Ferns Brit. India: 225. 1883.

Description

Rhizome short, erect to ascending, densely scaly near apex; scales rather stiff, about 13 by 1.5 mm, dark brown, entire. Stipes castaneous or paler, scaly at base, densely pubescent throughout, up to 25 cm long. Laminae subdeltoid, tripinnatifid at base, up to 30 by 20 cm; rachis winged at upper part; lateral pinnae about 10 pairs, basal pinnae the largest, asymmetrically oblong-subdeltoid, falcate, acuminate at apex, unequally broadly cuneate at base, up to 15 by 12 cm, stalked, with larger basiscopic pinnules; middle pinnae ascending, shortly stalked, oblong-lanceolate with caudate apex and broadly cuneate base; upper pinnae sessile to adnate at base; basal pinnules of larger pinnae free, shortly stalked, oblong-subdeltoid to lanceolate, basiscopic one up to 8 by 2.5 cm, acroscopic ones 3.5 by 2 cm, deeply lobed almost to costules, smaller pinnules sessile or adnate, oblong-subtriangular; ultimate segments rounded, oblique, entire or serrate; herbaceous, green to yellow-green, pubescent on both surfaces; costa and costules castaneous or paler, densely pubescent; veins anastomosing to form the costal and costular areoles. Sori terminal on free veinlets, medial or submarginal, about 0.8 mm diam.; indusia small, fugacious .

Distribution in Thailand

EASTERN: Chaiyaphum; SOUTH-WESTERN: Kanchanaburi; CENTRAL: Saraburi; SOUTH-EASTERN: Trat; PENINSULAR: Chumphon, Ranong, Surat Thani.

Wider Distribution

Sri Lanka, S China, Indochina, Malesia, north to Taiwan and the Ryikyus.

Ecology

On rocks, usually on limestone, or terrestrial in evergreen forests at low altitudes.

Similar species

Tectaria manilensis (C.Presl) Holttum

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is widespread and not under any known threat.

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